on 2005/02/01 5:15 PM, Moose at olymoose@xxxxxxxxxxxxxxx wrote:
>> Are there two of these Lines per conventional film line pair? Otherwise of
>> course they don't compare with pixels.
>>
>> That implies the film is only 50 lp/mm - mid-low grade for color films on
>> low-contrast targets, very low grade for high-contrast. As discussed earlier
>> here, see http://www.creekin.net/films.htm
>>
> I think we may assume that the testers at Pop Photo are not idiots and
> thus the film number is something like 100 lp/mm, low contrast target,
> no matter how the editors shorten it to just 'lines' in the printed
> review. Whatever it's other failings, PP is not some guy testing in his
> basement and posting drivel full of typos due to lack of sleep on his
> web site. The normal test of reasonableness suggests this too, as the
> site you cite suggests, which is why I said I assume 'lines' to be line
> pairs.
1) The fact that they probably aren't idiots (my assumption too) means they
are probably trying to use a measure that applies to both film and sensors
and allows comparison.
2) Because a line pair requires two pixels to sense, (1) implies that two of
these Lines make up a line pair - otherwise they wouldn't match up with
pixels.
3) The color neg film was rated at 2400 => 100 Lines/mm => 50 lp/mm.
Anyway, the point is that if you take some kind of value for a good slide
film under real-life contrast (say by interpolating between low and high
contrast) it still has some edge - please excuse the pun. That's also borne
out by real-life prints I've seen. And the point of that? I'll be buying a
serious digital camera sometime, but my wallet's in no danger of friction
burns. I don't see any need for a hurry.*
* I do like the quick feedback, but a P&S gives me that.
Andrew
(just finished a first roll of 2475, and keen to see the result, but not for
the resolution)
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